[SOLVED]Widget connection doubt

wwolff

Hi!

I have a Widget working with OpenGL properly and i create a Camera Object and i´m trying connect some signals form my Widget to my Camera Object.

In my main.cpp i have the following code:

CI3DCamera *pCam = new CI3DCamera;

GLWidget widget(0);
widget.resize(640, 480);

QObject::connect(&widget,&GLWidget::initializeGL,pCam,&CI3DCamera::Inicializa);

widget.show();
return a.exec();

But....i receive the following error:
main.cpp
C:\Qt\Qt5.1.0\5.1.0\msvc2012_64_opengl\include\QtOpenGL/qgl.h(364) : error C2440: 'initializing' : cannot convert from 'void' to 'int'
Expressions of type void cannot be converted to other types
c:\qt\qt5.1.0\5.1.0\msvc2012_64_opengl\include\qtcore\qobject.h(220) : see reference to function template instantiation 'void QGLWidget::qt_check_for_QOBJECT_macro<GLWidget>(const T &) const' being compiled
with
[
T=GLWidget
]
..\INS2\main.cpp(23) : see reference to function template instantiation 'QMetaObject::Connection QObject::connect<void(__cdecl GLWidget::* )(void),void(__cdecl CI3DCamera::* )(void)>(const GLWidget ,Func1,const CI3DCamera ,Func2,Qt::ConnectionType)' being compiled
with
[
Func1=void (__cdecl GLWidget:: )(void),
Func2=void (__cdecl CI3DCamera:: )(void)
]
jom: C:\William\PUC-pr\professor\Programa‡Æo Engine\Projeto - Insane Engine\Qt\build-INS2-Desktop_Qt_5_1_0_MSVC2012_OpenGL_64bit-Debug\Makefile.Debug [debug\main.obj] Error 2
jom: C:\William\PUC-pr\professor\Programa‡Æo Engine\Projeto - Insane Engine\Qt\build-INS2-Desktop_Qt_5_1_0_MSVC2012_OpenGL_64bit-Debug\Makefile [debug] Error 2
17:11:05: The process "C:\Qt\Qt5.1.0\Tools\QtCreator\bin\jom.exe" exited with code 2.
Error while building/deploying project INS2 (kit: Desktop Qt 5.1.0 MSVC2012 OpenGL 64bit)
When executing step 'Make'
17:11:05: Elapsed time: 00:03.

Anyone know why these error happen, and how to solve it?

SGaist

Hi,

I'm not yet a Qt 5 expert but judging from your code and the error message:

you don't have the Q_OBJECT macro in your GLWidget declaration

you are trying to connect initializeGL which is not a signal, it's a function you have to implement

Hope it helps

wwolff

Hi!
Thanks so Musch for your help.
I made the changes informed , but i start receive another error.

This is My Widget class:
@
class GLWidget : public QGLWidget
{

Q_OBJECT

public:
GLWidget(QWidget *parent);
~GLWidget();
public:
void initializeGL();
void resizeGL(int w, int h);
void paintGL();
void timerEvent(QTimerEvent *) { update(); }
void mousePressEvent(QMouseEvent *) { killTimer(timerId); }
void mouseReleaseEvent(QMouseEvent *) { timerId = startTimer(20); }
signals:
void Inicializa();
void Renderiza();
public:
int timerId;
};
@

This is my Camera Class:
@
class CI3DCamera : public QObject
{
Q_OBJECT

public:

explicit CI3DCamera(QObject *parent = 0);

float     I3D_Velocidade     ;// Velocidade da camera
float     I3D_Intervalo      ;// Intervalo dos Frames

CI3DVetor    I3D_CameraPos         ;// Posicao da camera
CI3DVetor    I3D_CameraView        ;// Visão da Câmera
CI3DVetor    I3D_CameraUp          ;// Direcao Superior
CI3DVetor    I3D_CameraStrafe      ;// Strafe

float     i3dFramesPorSegundo    ;
float     i3dUltimoTempo   ;
float     i3dTempoFrame          ;

int       AtTela;
int       LgTela;

signals:
void Inicializa ( );

public slots:

  void SetaCamera            (float i3dPosicaoX          ,
                              float i3dPosicaoY          ,
                              float i3dPosicaoZ          ,
                              float i3dViewX             ,
                              float i3dViewY             ,
                              float i3dViewZ             ,
                              float i3dUpX               ,
                              float i3dUpY               ,
                              float i3dUpZ               );
  void PegaDirecao           (float &i3dPosicaoX         ,
                              float &i3dPosicaoY         ,
                              float &i3dPosicaoZ         );

  CI3DVetor PegaDirecao      (                           );

  void MoverCamera           (float i3dDirecao           );

  void AtualizaCamera        (float xDir                 ,
                              float yDir                 ,
                              float zDir                 ,
                              float dir                  );
  void Rodar                 (float i3dAnguloDirecao     ,
                              float i3dPosicaoX          ,
                              float i3dPosicaoY          ,
                              float i3dPosicaoZ          );

  void MapeiaMouse           (                           );
  void CalculaStrafe         (                           );
  void CameraStrafe          (float        i3dDirecao    );
  void PosicionaCamera       (                           );
  void CalculaTempo          (                           );
  void ResetaCamera          (                           );
  void CalculaPerspectiva    (float i3dProx,float i3dDist);

};
@

The main have this code:
@
CI3DCamera pCam;

GLWidget widget(0);
widget.resize(640, 480);
//widget.showFullScreen();

QObject::connect(&widget,&GLWidget::Inicializa,&pCam,&CI3DCamera::Inicializa);

widget.show();
return a.exec&#40;&#41;;

@

But i start receive the following error:
main.obj : error LNK2019: unresolved external symbol "public: void __cdecl CI3DCamera::Inicializa(void)" (?Inicializa@CI3DCamera@@QEAAXXZ) referenced in function main
main.obj : error LNK2001: unresolved external symbol "public: static struct QMetaObject const GLWidget::staticMetaObject" (?staticMetaObject@GLWidget@@2UQMetaObject@@B)
glwidget.obj : error LNK2019: unresolved external symbol "public: static struct QMetaObject const GLWidget::staticMetaObject" (?staticMetaObject@GLWidget@@2UQMetaObject@@B) referenced in function "public: void __cdecl std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> >::_Xran(void)const " (?_Xran@?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@QEBAXXZ)
glwidget.obj : error LNK2001: unresolved external symbol "public: virtual struct QMetaObject const * __cdecl GLWidget::metaObject(void)const " (?metaObject@GLWidget@@UEBAPEBUQMetaObject@@XZ)
glwidget.obj : error LNK2001: unresolved external symbol "public: virtual void * __cdecl GLWidget::qt_metacast(char const *)" (?qt_metacast@GLWidget@@UEAAPEAXPEBD@Z)
glwidget.obj : error LNK2001: unresolved external symbol "public: virtual int __cdecl GLWidget::qt_metacall(enum QMetaObject::Call,int,void * *)" (?qt_metacall@GLWidget@@UEAAHW4Call@QMetaObject@@HPEAPEAX@Z)
debug\INS2.exe : fatal error LNK1120: 6 unresolved externals
jom: C:\William\PUC-pr\professor\Programa‡Æo Engine\Projeto - Insane Engine\Qt\build-INS2-Desktop_Qt_5_1_0_MSVC2012_OpenGL_64bit-Debug\Makefile.Debug [debug\INS2.exe] Error 1120
jom: C:\William\PUC-pr\professor\Programa‡Æo Engine\Projeto - Insane Engine\Qt\build-INS2-Desktop_Qt_5_1_0_MSVC2012_OpenGL_64bit-Debug\Makefile [debug] Error 2
18:53:19: The process "C:\Qt\Qt5.1.0\Tools\QtCreator\bin\jom.exe" exited with code 2.
Error while building/deploying project INS2 (kit: Desktop Qt 5.1.0 MSVC2012 OpenGL 64bit)
When executing step 'Make'
18:53:19: Elapsed time: 00:04.

Can you help me , please?

Kind Regards.

SGaist

Did you run qmake after adding the Q_OBJECT macro ?

Also, are you sure you want to connect two signals together ?

wwolff

Yest i compile the code after, and the message change as i show.

I change the:
@void Inicializa ( );@ Camera member to slot

The error still the same , i dont know why but it seems the framework simply doesn untderstand that is a member there...

wwolff

Just for instance, when you ask for qmake is compile code, is it?
Becouse i´m using MSVC compiler, automatcally configured when i install QC...

wwolff

Hey!
I run a option on the Build Menu with qMake , and runs fine...then wneh i try compile the code again it seems something change... i will check it out, but i still receiving errors...
allways when i change the code i need run qMake?

Kind Regards, and thanks so much for your help!

wwolff

Hi SGaist !

It seems is a problem with other places with my code...
when i start run qMake before Build it...the things start to work.
I will fix the other parts of my code.

Thanks so much for your help!

wwolff

Hi!

It seems the compilations are working now...but i´m receiving this error now:

moc_glwidget.obj : error LNK2005: "public: void __cdecl GLWidget::Inicializa(void)" (?Inicializa@GLWidget@@QEAAXXZ) already defined in glwidget.obj
moc_glwidget.obj : error LNK2005: "public: void __cdecl GLWidget::Renderiza(void)" (?Renderiza@GLWidget@@QEAAXXZ) already defined in glwidget.obj
debug\INS2.exe : fatal error LNK1169: one or more multiply defined symbols found
jom: C:\William\PUC-pr\professor\Programa‡Æo Engine\Projeto - Insane Engine\Qt\build-INS2-Desktop_Qt_5_1_0_MSVC2012_OpenGL_64bit-Debug\Makefile.Debug [debug\INS2.exe] Error 1169
jom: C:\William\PUC-pr\professor\Programa‡Æo Engine\Projeto - Insane Engine\Qt\build-INS2-Desktop_Qt_5_1_0_MSVC2012_OpenGL_64bit-Debug\Makefile [debug] Error 2
20:18:40: The process "C:\Qt\Qt5.1.0\Tools\QtCreator\bin\jom.exe" exited with code 2.
Error while building/deploying project INS2 (kit: Desktop Qt 5.1.0 MSVC2012 OpenGL 64bit)
When executing step 'Make'
20:18:40: Elapsed time: 00:09.

It seems the members i put on my widget declaration are not in the correct place??? what is moc_glwidget.obj ???

wwolff

Hi!

I Change the approach (making a instance of my Camera inside the Widget) , and using qMake , than my code works fine!

Thanks so much for the help!

Kind Regards.

SGaist

You're welcome !

Don't forget to update your thread's title prepending solved so other forum users may know a solution has been found :)